Just so happens that Catherine, the saint in question, died at 24.
Betrothed at 4, married at 14, widowed at 20, with three kids. Apparently a big enough name to make me wonder if you were already familiar with her. Meaning no disrespect, but I couldn’t see anything especially remarkable about her in the brief bios I checked. (Other than the many parallels in her life’s outline to that of Aisha, the most famous female muslim.)
Human mores remain more changeable than their biology. With rare exception, based purely on brain development, a 14 year-old girl lacks the necessary agency to consent to marriage. For much of human history, this was not a concern. Women were property.